Steam-generator



(NofModel.) v

- 4 D-.MGBRIDE- GRAHAM.

VS'IEAM GENERATOR.

Patented Nov. 6, 1883..

N. PETERS. Plmm-Lmmmplm. wmlunglon, D. t:4

\ UNITED v SrAr-ns 'A-PATENT OFFICE- f DANIEL MCBRIDE GRAHAM, or CHICAGO, ILLINOIS? STEAM-GENERATOR. y

SPECIFICATION forming part of Letters Patent No. 287,824, dated November 6, 1883. Application filed March 12, 1883. (No model.)

To all whom t may concern,.- v

Be it known that I, DANIEL MCBRIDE GRA- HAM, of Chicago, of the county of Cook, of the State of Illinois, have invented a new and useful Improvement in Steam-Generators; and I do hereby declare the same to be described iny the following specification and represented in the accompanying drawing.

'Ihe said drawing is a transverse and vertical section of an upright steam generator or boiler provided with my invention, the nature of which is defined in the claim hereinafter presented. f

My said inventionmay be used for heating air for warming the apartments lof a building or dwelling, as in such case it will only be necessary to let,instead of water,into the boiler the air to be heated, and to cause such air, after being heated, to flow or pass from the boiler through one or more' educts or pipes to the room or rooms to be warmed. A

Myinvention is especially applicable to upright steam-generators.

' In the drawing, A denotes a multitubular boiler, consisting of a cylindrical drum and a series of pipes, B, extending through it from head to head and opening through the heads. The boiler is arranged over a fire-place or chamber of combustion, C, whose grate is shown at D, and ash-pit or chamber E. Over the upper end of the boiler is the smoke archv or dome F, provided with an educt, G, to lead the waste smoke and spent volatile products of Acombustion to a chimney or into the open air. Surrounding the fire-place and the boiler is a duplex air-jacket, consisting of an annular chamber, H, having within it, and arranged concentrically therein, an annular partition, I, which extends from the bottom nearly to the top of the chamber II. In the lower part of the outershell, a, of the chamber H there is one or a series of air-inlets, b, and

` the combustion-chamber.

there is in the inner shell, c, comprising or encompassing the combustion or fuel chamber C, a series of air-inlets, d, they being arranged so as to discharge air directly upon the upper surface of the fuel or into the upper part of provided with an'inlet for water and an out- The boiler isto be' boilers, the lwater and steam spaces being within the drum and about. the tubes thereof, through which the smoke and volative products of combustion pass from the fire-place into the dome F, and thence through and out of its outlet G. y Y

While the boiler may be in operation air will be drawn into the duplex-j acket and will ascend rin the space thereof situated between the partition I and the outer shell, a, and will -flow over the top of such partition and rush downward in the spacebetween the ypartition and the boiler andfire-place, and be discharged into the latter through the inducts d.

In so doing, the air,before going throughfsuch inductS, will intercept the heat radiated from the boiler and shell c, the combustion of the smoke and gases in the fire-place being greatly promoted thereby. The fuel in burning will receive air through the grate.

The duplex jacket is serviceable in two ways-viz., in supplying heated air to the smoke and gaseous products of the fire-chamber, and in intercepting and utilizing heat that would be otherwise radiated and lost.

With a boiler constructed as above described7 very little smoke is. wasted, the combustible gases and smoke escaping from the fuel being mostly, if not entirely, utilized and burned, and in consequence thereof a material saving in fuel results. `In the said boiler it will be perceived that the duplex air-j acket is arranged wholly above the grate andashchamber, and in no respect operates'to discharge air into the latter, the air'heated in passing through the jacket being discharged into the fire-place above the fire-pot or fuelreceiving space. The air to pass into and up through the fuel is to come from and to enter the ash-chamber through its doorway, or by a suitable duct. Vith my improvement fresh air for supplying the flame and gasesemitted from thev fuel can be discharged into them over the fuel without it rst being caused to chamber, and thence into and caused to pass l arranged within such jacket, all being sub- 1o up through the gra-te and the fuel thereon. stantally as represented, and the said air- Therefore, jacket being provided with air inducts and I 1filaimeducts, as explained.

5 T e combination of the du lex air-jacket with the smoke-chamber or argh F, extended DANIEL MCBRIDE GRAHAM over the top of such jacket,l the ash-chamber l Witnesses:

E, extended beneath the bottom of such jack- R. H. EDDY, et, and the grate, re-place, and tube-stack E. B. PRATT. I 

